/* ===================

AX2E (AXESCON XACML 2.0 Engine) is the Java authorization engine, which implements OASIS XACML 2.0 standard.
Copyright (C) 2007 AXESCON LLC

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA


Contact: AXESCON LLC - info{at}axescon.com

 =================== */
package axescon.xacml.model.shared;

import axescon.xacml.api.XacmlException;

/**
 * @author argyn
 * Responsibilities: represents XACML Context schema element Decision
 * (@urn:oasis:names:tc:xacml:2.0:context:schema:os).
 * <p/>
 *
 */
public final class Decision extends Effect {

    public static final byte BYTE_INDETERMINATE = 3;
    public static final byte BYTE_NOT_APPLICABLE = 4;

    /**
     * builds Decision from its String value
     * @param value String value
     * @return Decision object
     * @throws XacmlException
     */
    public static byte forString(String value) throws XacmlException {
        if (STRING_PERMIT.equals(value)) return BYTE_PERMIT;
        if (STRING_DENY.equals(value)) return BYTE_DENY;
        if (STRING_INDETERMINATE.equals(value)) return BYTE_INDETERMINATE;
        if (STRING_NOT_APPLICABLE.equals(value)) return BYTE_NOT_APPLICABLE;
        throw new XacmlException("this is syntax exception, unknown decision: " + value);
    }

    public static final String STRING_INDETERMINATE = "Indeterminate";
    public static final String STRING_NOT_APPLICABLE = "NotApplicable";

    public static String toString(int d) {
        switch (d) {
            case BYTE_DENY:
                return STRING_DENY;
            case BYTE_PERMIT:
                return STRING_PERMIT;
            case BYTE_NOT_APPLICABLE:
                return STRING_NOT_APPLICABLE;
            case BYTE_INDETERMINATE:
                return STRING_INDETERMINATE;
            default:
                assert true: "Wrong decision: " + d;
                return "UNKNOWN DECISION ERROR";
        }
    }

}
